new VIPTime[MAX_PLAYERS];

public OnPlayerConnect(playerid) {
    VIPTime[playerid] = 0;

    // Load VIPTime from a file.

    if(VIPTime[playerid] != 0) {
        // Give them membership.
    }
    return 1;
}

public OnPlayerDisconnect(playerid, reason) {
    // Save the VIPTime variable.
}

public OnPlayerUpdate(playerid) {
    new Timestamp = gettime();

    if(Timestamp >= VIPTime[playerid]) {
        // Cancel their membership.

        VIPTime[playerid] = 0;
    }
    return 1;
}

stock AddMembershipForADay(playerid) {
    if(! IsPlayerConnected(playerid)) {
        return false;
    }

    if(VIPTime[playerid] == 0) { // new member
        VIPTime[playerid] += gettime();

        // Give them membership.
    }

    VIPTime[playerid] += (60 * 60 * 24);
    return true;
}

stock DisplayMembershipRemaining(playerid) {
    new Format[100] = "No membership!";

    if(! IsPlayerConnected(playerid)) {
        return '\0';
    }

    if(VIPTime[playerid] == 0) {
        return Format;
    }

    new timestamp = VIPTime[playerid] - gettime();
    new year = 0, day = 0, month = 0, hour = 0, mins = 0, sec = 0;
    new days_of_month[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

    while(timestamp > 31622400){
        timestamp -= 31536000;

        if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {
                timestamp -= 86400;
        }

        year++;
    }

    if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {
        days_of_month[1] = 29;
    }
    else {
        days_of_month[1] = 28;
    }

    while(timestamp > 86400) {
        timestamp -= 86400;
        day++;

        if(day==days_of_month[month]) {
            day = 0;
            month++;
        }
    }

    while(timestamp > 60){
        timestamp -= 60;
        mins++;

        if(mins == 60) {
                mins=0;
                hour++;
        }
    }

    sec = timestamp;
    format(Format, 31, "VIP Time Remaining: %02d/%02d/%d %02d:%02d:%02d", day+1, month+1, year, hour, mins, sec);
    return Format;
}